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comparison vdp.c @ 921:2be771c4dfbd

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After reviewing the results of my test ROM again it seems pretty clear that the VBlank flag gets set at the same time as the vcounter changes
author Michael Pavone <pavone@retrodev.com>
date Tue, 26 Jan 2016 19:23:10 -0800
parents e64168bb2b25
children 913a6336ce20
comparison
equal deleted inserted replaced
920:e64168bb2b25 921:2be771c4dfbd
1690 value |= 0x10; 1690 value |= 0x10;
1691 } 1691 }
1692 uint32_t line= context->vcounter; 1692 uint32_t line= context->vcounter;
1693 uint32_t slot = context->hslot; 1693 uint32_t slot = context->hslot;
1694 uint32_t inactive_start = (context->latched_mode & BIT_PAL ? PAL_INACTIVE_START : NTSC_INACTIVE_START); 1694 uint32_t inactive_start = (context->latched_mode & BIT_PAL ? PAL_INACTIVE_START : NTSC_INACTIVE_START);
1695 if ( 1695 if ((line >= inactive_start && line < 0x1FF) || !(context->regs[REG_MODE_2] & BIT_DISP_EN)) {
1696 (
1697 line > inactive_start
1698 && line < 0x1FF
1699 )
1700 || (line == inactive_start
1701 && (
1702 slot >= (context->regs[REG_MODE_4] & BIT_H40 ? VBLANK_START_H40 : VBLANK_START_H32)
1703 || slot < (context->regs[REG_MODE_4] & BIT_H40 ? LINE_CHANGE_H40 : LINE_CHANGE_H32)
1704 )
1705 )
1706 || (line == 0x1FF
1707 && slot < (context->regs[REG_MODE_4] & BIT_H40 ? VBLANK_START_H40 : VBLANK_START_H32))
1708 && slot >= (context->regs[REG_MODE_4] & BIT_H40 ? LINE_CHANGE_H40 : LINE_CHANGE_H32)
1709 || !(context->regs[REG_MODE_2] & BIT_DISP_EN)
1710 ) {
1711 value |= 0x8; 1696 value |= 0x8;
1712 } 1697 }
1713 if (context->regs[REG_MODE_4] & BIT_H40) { 1698 if (context->regs[REG_MODE_4] & BIT_H40) {
1714 if (slot < HBLANK_END_H40 || slot > HBLANK_START_H40) { 1699 if (slot < HBLANK_END_H40 || slot > HBLANK_START_H40) {
1715 value |= 0x4; 1700 value |= 0x4;